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Skeletal system: Bones, cartilage, tendons and ligaments. Muscular System: Skeletal muscles and smooth muscles throughout the body. Circulatory System: Heart, blood vessels, and blood. Nervous System: Brain, spinal cord, and peripheral nerves. Respiratory System: Nose, trachea, and lungs. Digestive System: Mouth, esophagus, stomach, small and large intestines. Excretory System: Kidneys, ureters, bladder, and urethra. Endocrine System: Hypothalamus, pituitary, thyroid, pancreas, and adrenal glands. Reproductive System: Testes, seminal vesicles, and penis. Immune System: Lymph, lymph nodes, white blood cells, T-cells and B-cells.